Search for dissertations about: "Quantum yield"

Showing result 1 - 5 of 103 swedish dissertations containing the words Quantum yield.

2. 1. Luminescent Silicon Nanocrystals: From Single Quantum Dot to Light-harvesting Devices

   Author : Jingjian Zhou; Ilya Sychugov; Jan Linnros; Peter Schall; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; silicon quantum dots; photoluminescence; quantum yield; internal quantum efficiency; luminescent solar concentrator; Optics and Photonics; Optik och fotonik;

   Abstract :       Silicon (Si) serves as the basic material of the system-on-a-chip industry and photovoltaic panels nowadays. This is mostly thanks to its high abundance in the earth’s crust, thereby low cost, virtually non-toxicity, and superior stability. READ MORE

4. 2. Quantum Chemical Studies of Radical Cation Rearrangement, Radical Carbonylation, and Homolytic Substitution Reactions

   Author : Daniel Norberg; Nessima Salhi-Benachenhou; Sten Lunell; Tim Clark; Uppsala universitet; []
   Keywords : Quantum chemistry; quantum chemistry; coupled-cluster; density functional theory; meta-GGA; reaction mechanism; potential energy surface; isomerization; fragmentation; dissociation; condensation; addition; SH2; hydrogen abstraction; iodine atom transfer; complex; weakly interacting system; hyperfine coupling constant; Kvantkemi;

   Abstract : Quantum chemical calculations have been performed to investigate radical cation rearrangement, radical carbonylation, and homolytic substitution reactions of organic molecules. The rearrangement of the bicyclopropylidiene radical cation to the tetramethyleneethane radical cation is predicted to proceed with stepwise disrotatory opening of the two rings. READ MORE

5. 3. Surface-normal multiple quantum well electroabsorption modulators : for optical signal processing and asymmetric free-space communication

   Author : Stéphane Junique; Lars Thylén; Uzi Efron; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; spatial light modulators; quantum wells; optical resonator; Fabry–Pérot cavity; electroabsorption modulator; free–space optical communication; Photonics; Fotonik;

   Abstract : Electroabsorption is the physical phenomenon by which the absorption of light in a medium can be controlled by applying an electric field. The Quantum–Confined Stark Effect, which makes the absorption band–edge in quantum wells very field–dependent, together with the strong absorption peak provided by excitons, are the physical foundations for the success of electroabsorption modulators based on quantum well structures in telecommunication networks. READ MORE

6. 4. Quantum Hall devices on epitaxial graphene: towards large-scale integration

   Author : Arseniy Lartsev; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; quantum Hall effect; resistance metrology; epitaxial graphene; quantum Hall array; magnetotransport;

   Abstract : Quantum Hall devices have been used as the primary standard of electrical resistance for over two decades, and they are unlikely to be replaced in this role any time soon. The work presented in this thesis was being done towards the goal of establishing epitaxial graphene on silicon carbide as a new material of choice for these devices. READ MORE

7. 5. Classical and Quantum Descriptions of Proteins, Lipids and Membranes

   Author : Richard Tjörnhammar; Olle Edholm; Sagar Pandit; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Quantum corrections; Coordination structure; Polarisation; Phase transitions; Kelvin differential equation; Line tension; Elastic membrane models; Molecular particle models; Zinc binding; Cholesterol and Phospholipids; Biological Physics; Biologisk fysik;

   Abstract : In this thesis the properties of proteins and membranes are studied by molecular dynamics simulations. The subject is decomposed into parts addressing free energy calculations in proteins, mechanical inclusion models for lipid bilayers, phase transitions and structural correlations in lipid bilayers and atomistic lipid bilayer models. READ MORE